Dynamic Advective Water Quality Model for Rivers

Abstract

A dynamic water quality model for storm induced flows in rivers is presented. The hydrodynamic portion is solved by a four‐point implicit Newton‐Raphson procedure, while the water quality code is formulated with a Holley‐Preissmann nonlinear formulation. The water quality model represents the effects of biodegration by plankton, sedimentation, and diffusion of material into the benthos by a single turbulence dependent decay term. Eight constituents are employed and the effects of light shading are considered. Two simple tests were used to provide simple initial calibrations. The first test, the propagation of a Gaussian wave, demonstrated the necessity of higher order treatment of the water quality numerical analog. The second test was a steady state test of the water quality model against data from the Olentangy River. The minimum kinetic structure required for Ohio streams should include CBOD, organic nitrogen, ammonia nitrogen, nitrate nitrogen, and orthophosphate.